Reports until 05:37, Wednesday 24 May 2023
H1 General
ryan.crouch@LIGO.ORG - posted 05:37, Wednesday 24 May 2023 - last comment - 18:06, Friday 26 May 2023(69873)
OPS Wednesday OWL mid shift update pt2

We lost lock from what seems to have been PI29 at 11:25 UTC (I stepped down the EX ring heaters to 1.2 following Sheilas alog after that) and I haven't been able to lock ALS since, green arms was a big struggle especially Yarm. After a bunch of rounds of adjusting, letting increase flashes run, and a few ALS locklosses I started another initial alignment at 12:32UTC.

Comments related to this report
ryan.crouch@LIGO.ORG - 06:06, Wednesday 24 May 2023 (69875)
Link

After the IA I still can't lock ALS, it look like the IMC keeps losing lock while ALS_COMM is in HANDOFF_PART2 which then stalls

ryan.crouch@LIGO.ORG - 07:03, Wednesday 24 May 2023 (69876)
Link

PR3 had drifted a bit, I touched it by .8 microradians in yaw and it was then able to lock als

jeffrey.kissel@LIGO.ORG - 18:06, Friday 26 May 2023 (69953)
Link 

In the end the PR3 alignments was a temporary fix for the true problem. The true problem was that the HAM-ISIs were all drifting off in Yaw (RZ) slowly, but surely, for weeks -- see LHO:69934.